Add a temporary IPv6 address to your server

To add a temporary IPv6 address to your server, use the following command:

ip -6 addr add IPV6_ADDRESS/64 dev primary

This IP can now be used but will be removed when you reboot your server or a restart of the network service.

Remove this temporary IPv6 address without rebooting

To remove this temporary IPv6 address, use the following command:

ip -6 addr del IPv6_address/64 dev primary

Add a static IPv6 address to your server

Edit the network interface

nano /etc/sysconfig/network-scripts/ifcfg-primary

And add the following block:

IPV6INIT=yes

IPV6_PEERROUTES="yes"

IPV6_PRIVACY="no"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL="no"

IPV6ADDR=FIRST_IPV6_ADDRESS/64

IPV6_DEFAULTGW=IPV6_GATEWAY

 

Add additional IPv6 addresses to your interface

Add the following line to your network interface:

IPV6ADDR_SECONDARIES="SECOND_IPV6_ADDRESS/64 THIRD_IPV6_ADDRESS/64"

The complete IPv6 block should look like this:

IPV6INIT=yes

IPV6_PEERROUTES="yes"

IPV6_PRIVACY="no"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL="no"

IPV6ADDR=PRIMARY_IPV6_ADDRESS/64

IPV6_DEFAULTGW=IPV6_GATEWAY

IPV6ADDR_SECONDARIES="SECOND_IPV6_ADDRESS/64 THIRD_IPV6_ADDRESS/64"

Restart the network service to apply the new configuration

CentOS 6

service network restart

CentOS 7

systemctl restart network